Table 1.
Parameters for subtypes and classification of subtypes compared between patients aged 50–69 years (ESG) and patients ≥70 years (NESG)
| Parameter | ESG (n = 2171/62.7%) | NESG (n = 1292/37.3%) | Total (n = 3463/100%) |
|---|---|---|---|
| Age (year), mean ± SD) | 59.7 ± 6 | 77.1 ± 5 | 66.2 ± 10 |
| Estrogen receptor, n (%) | |||
| Positive | 1873 (86.3) | 1132 (87.6) | 3005 (86.8) |
| Negative | 298 (13.7) | 160 (12.4) | 458 (13.2) |
| Progesterone receptor, n (%) | |||
| Positive | 1675 (77.2) | 1000 (77.4) | 2675 (77.2) |
| Negative | 496 (22.8) | 292 (22.6) | 788 (22.8) |
| Receptor Status, n (%) | |||
| ER + PR+ | 1651 (76.0) | 984 (76.2) | 2635 (76.1) |
| ER + PR− | 222 (10.2) | 148 (11.5) | 370 (10.7) |
| ER−PR+ | 24 (1.1) | 16 (1.2) | 40 (1.2) |
| ER−PR− | 274 (12.6) | 144 (11.1) | 418 (12.1) |
| Grading, n (%) | |||
| G1 | 448 (20.6) | 188 (14.6) | 636 (18.4) |
| G2 | 1273 (58.6) | 820 (63.5) | 2093 (60.4) |
| G3 | 450 (20.7) | 284 (22.0) | 734 (21.2) |
| HER2 Status, n (%) | |||
| Positive | 376 (17.3) | 208 (16.1) | 584 (16.9) |
| Negative | 1795 (82.7) | 1084 (83.9) | 2879 (83.1) |
| Ki-67 categories [%], n (%) | |||
| 0–15 | 1276 (58.8) | 761 (58.9) | 2037 (58.8) |
| 16–25 | 401 (18.5) | 258 (20.0) | 659 (19.0) |
| 26–35 | 204 (9.4) | 125 (9.7) | 329 (9.5) |
| 36–45 | 104 (4.8) | 57 (4.4) | 161 (4.6) |
| >45 | 186 (8.6) | 91 (7.0) | 277 (8.0) |
| Classification of subtypes, n (%) | |||
| Luminal A | 1111 (51.2) | 659 (51.0) | 1770 (51.1) |
| Luminal B | 504 (23.2) | 333 (25.8) | 837 (24.2) |
| HER2-like | 376 (17.3) | 208 (16.1) | 584 (16.9) |
| Basal-like | 180 (8.3) | 92 (7.1) | 272 (7.9) |